关键词: 走向长钻孔, 卸压瓦斯, 立体空间, 关键参数, 安全生产

Abstract: In order to give full play to the role of strike long boreholes in gas control, the principle of gas extraction and relief by strike long boreholes is analyzed and summarized. By means of theoretical analysis, numerical simulation and physical simulation, the key spatial parameters of strike long borehole group are summarized and studie,And according to the working face before the initial pressure and normal production period of gas gush, roof overburden and engineering construction quality and other actual conditions,the theoretical spatial distribution range of strike long borehole group was obtained as follows: 9~50m above the top plate, 10~60m in the return air lane, spacing between drilling fields shall not be greater than 500m, and the lap distance between drilling holes in adjacent drilling fields shall not be less than 80m; On the basis of the research, The engineering practice and the effect of gas control in working face are investigated. The results showed that: The gas extraction purity of 1# drilling field is 0.29m3/min~0.75m3/min. The gas extraction purity of the 2# drilling field is 0.38m3/min~1.42m3/min; The maximum gas concentration in the upper corner is 0.7%, and the maximum gas concentration in the return air flow is 0.56%. The reasonable arrangement of the strike long borehole group in the three-dimensional space,Ensure the safety of the coal Face before the initial pressure and the normal production period.At the same time, the purpose of full drainage of pressure relief gas is realized.

Key words: Strike long borehole, Pressure relief gas, Three-dimensional spatial , Key parameters , Safe production